Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf5b8ba50d2e35d…

MALICIOUS

PDF

80.3 KB Created: 2021-05-19 06:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e5eabd36fe2bbd523ae588ac5cc57ee2 SHA-1: 33cd5ef55a092012f604fc3263e025ae63f6fa81 SHA-256: 5bf5b8ba50d2e35d952a21d5c2fd11e22c7d905c7165340076731069d94c4de8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://jacksth.ru/strik?utm_term=income+and+expenditure+account+and+balance+sheet+format+pdf', is likely part of a phishing or scam campaign, disguised as a financial document. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=income+and+expenditure+account+and+balance+sheet+format+pdf PDF link annotation
    • https://zosonokabawim.weebly.com/uploads/1/3/4/3/134316026/vujogivuma.pdfIn PDF document text
    • http://xodiseboselana.22web.org/savira.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/dilamovizas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413843/normal_5fcf4a59e2673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_603b62dadeea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392207/normal_60629eca67e12.pdfIn PDF document text
    • https://jeradowekijulu.weebly.com/uploads/1/3/0/7/130739924/lizifi.pdfIn PDF document text
    • https://nipawivas.weebly.com/uploads/1/3/2/6/132680981/5749379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426953/normal_5fe465c0bd6cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485005/normal_6023e3f5465c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5fd7d6571df28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444113/normal_5fd959d0e9602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_6046b740ae6b5.pdfIn PDF document text
    • http://gukibipujuregof.22web.org/39686227306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_6069e7d78e8be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e1e3742c-bab7-49a9-ba98-d0e572b3e8f7/will_hydrogen_peroxide_cure_toenail_fungus.pdfIn PDF document text
    • http://nexuvojof.epizy.com/authoritarian_personality.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78381056-70f2-438f-bd2e-8c267d2c72d6/el_talmud_en_espaol_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725e6921-f2f8-4bff-8dcd-423ef2fac6ae/82197508358.pdfIn PDF document text
    • http://sotemapepuko.epizy.com/73851305030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2425c1b3-0350-4781-9a64-2aa8cd549fb7/what_does_a_non_commissioned_officer_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27c6cbb-9fb9-448a-b183-6697d768bcc8/80647565870.pdfIn PDF document text
    • http://mimodiko.epizy.com/base64_to_conversion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0ecdac-49a5-43c0-907d-d07d2adccae4/creative_sound_blaster_x-fi_surround_5.1_pro_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a042b871-a993-43ee-9b40-c3e6b65ca249/my_loan_choice_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e077c7-7e28-4e7f-8a62-4d4cca3d8512/where_to_recycle_sodastream_bottles.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 5420 bytes
SHA-256: b906ee4ce4cea61ebbd856b12ba72fdc18ae3af0b589f89579aa83b063df3d08
font_01_sfnt_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 10640 bytes
SHA-256: 5915c7dbf774e5d9a5a7543678c1f0bc2e9b3bc2dc8e5aaa59265c9c16f33781
font_02_sfnt_off000124c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2